I can hear up to 17kHz. I'm 16 YO. I had serious hearing problems when I was little, so I don't know if its good or bad for my age.
I still have to take a second to process what people are saying when they are talking to me every once in a while

Probably a brain thing.
Edit: Just tested again and I can hear up to 18kHz, but I have to turn my volume a little above my normal listening level. Hard to hear too.
Edited by G4Oblivion - 4/15/11 at 2:06am